Figure shows the \( \mathrm{v}-\mathrm{t} \) graph for two particles \( \mathrm{P} \) and \( \ma...

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Figure shows the \( \mathrm{v}-\mathrm{t} \) graph for two particles \( \mathrm{P} \) and \( \mathrm{Q} \). Which of the following statements regarding their relative motion is true?
Their relative velocity
(a) is zero
(b) is non-zero but constant
(c) continuously decreases
(d) continuously increases
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